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July 17, 2017

PVC calendering transparent sheet is one of the main varieties of hard PVC. It is usually produced by conical twin-screw extruder. The problems encountered in the process of production are: bubbles,crystal spots, yellow color of sheet material and so on. I according to...

July 12, 2017

I. Crack and Thread

(1) raw materials are not sufficiently dry. The pre drying temperature should be increased and the drying time should be prolonged.

(2) impurities in the raw material are mixed with foreign matter. Should be completely removed.


(3) the melt temperatur...